Duplicate

Idk about this solution, but it's cool. I like it.;)

Fixed.

same, adopts the match pattern

fixed

Approved

python new test framework is required. updated in this fork

new line issue

yes, get a new way :)

same =(

Not anymore. =P

Nevermind: I went ahead and implemented the necessary changes.

• Updated description: removed swift-specific code block, reformatted examples.
• Added None-case sample test
• Included more helpful assertion messages in all tests
• Cleaned up test module.

We are currently debating whether a signature change for the sake of being idiomatic is worth nuking all existing solutions.
Until then, could you please update all assertions to include clarification about what "left" and "right" means in the default error message?